Shock absorber for pneumatic hammers



Sept. 20, 1927. ,759

A. D.,WILLIAMS ET AL SHOCK ABSORBER FOR PNEUMATIC HAMMERS Filed May 8. 1926 I ,4 TTORNE Y5 Patented Sept. 20, 1927.

"PATENT OFF-ICE.

AUSTIN D. WILLIAMS AND FRANK J. HIcKEYQor SACRAMENTO,CALIFORNIA.

SHOCK ABSORBER FOR PNETTMATIC HAMMER' S.

Application filed May 8, 1926. Serial No. 107,565.

Our invention relates to an attachment for portable percussion tools such as pneumatic hammers and the like,.and has for its object to relieve the operator from the vibration consequent to the use of such tools. A further object is to provide a device for the described purpose which is easily attached to existing tools without alteration.

Our invention is herein described and illustrated as applied to a common form of pneumatic hammer used for riveting, but it will be apparent that it may be employed without material change on other forms of percussion tools. It should be understood, moreover, that the form, proportion, and arrangement of the several parts may be Varied, within the limits of the claims hereto appended, without departing from the spirit of the invention.

With this in view a preferred embodiment of our invention will now be described fully with reference to the. accompanying drawings, wherein f Fig. 1 is a side elevation of our shock absorber applied to a common'form of pneumatic hammer.

Fig. 2 is a plan of the bar member only. i

Fig. 3 is a part sectional plan of the collar member and springs, the hammer and the bar member being omitted.

In the drawings, the reference numeral 1 designates the body or barrel .of a pneumatic hammer, and 2 is its handle. 3 is a collar which is securely attached, preferably by shrinking on, to the upper end of the barrel 1, and which is provided with a circumferential groove 4 in which are seated the two complementary halves of a split ring 5, preferably formed of spring steel. Each half of said split ring is provided with eyes 6 at its ends, through which are passed bolts 7 to hold the two halves together, and to keep them seated in the groove 4.

From said bolts 7 are hung tension springs 8, the upper end eyes 9 of said springs being clamped, preferably, between the two adjacent eyes 6 of the split ring, as shown. The lower ends of the springs 8 are connected with eyes 10 secured to a yoke 11 which freely surrounds the barrel 1 with substantial clearance. The yoke 11 forms an integral part of a substantially rigid bar or lever member 12, one end of which is provided with a hook 13, and the other end of which is extended to form a handle 14.

In using the device, one end of the bar 12 is connected, by any suitable universal fulcrum, as for example by the hook 13 and a chain 15, with afixed support, not shown, which may be a portion of the work. Thus if the hammer be used for riveting a boiler shell, for example, the chain 15 could be passed entirely around the boiler, and fastened or tightened by any well known means to form a secure anchor for the left hand, or short, end portion of the bar 12. The hammer is guided to'its desired position by an operator who holds the handle 2, but the necessary pressure, to hold the hammer on the work during its operation, is applied by a second operator who bears down on the long or handle end 14 of the bar 12. The substantial clearance of the yoke 11 about the barrel 1 provides for any practical angular idjustment of the barrel relatively to the wor The vibration of the barrel 1 is absorbed by the springs 8, so that the bar operator, bearing on the handle 14, suffers no inconvenience, and thehammer operator, having merely to guide the hammer to position, can hold the handle 2 loosely, or even let go altogether until the operation is finished and it becomes necessary to shift the hammer to a new position. Thus neither operator is subjected to the disagreeable and tiring vibration met with in the ordinary use of tools of this type. It will be seen that the device can be easily applied to existing tools, merely by shrinking on the collar 3, and then attaching the split ring 5 and the springs 8 by means of the bolts 7. If it be desired to use the hammer without the shock absorber, it is only necessary to remove the split ring and springs, leaving the collar 3 upon the barrel. We claim 1. A shock absorber for pneumatic hammers and the like comprising a substantially rigid bar formed at one end with a handle, and intermediate its ends formed with a yoke adapted to freely surround the hammer barrel with substantial clearance; a universal fulcrum anchor connection at the other end of said bar and springs connecting said yoke with said barrel. 2. A shock absorber for pneumatic ham mers and the like comprising a substantially rigid bar formed at one end with a handle, and intermediate its ends formed with a yoke adapted to freely surround the hammer baroppositely disposed springs secured at one rel with substantial clearance; a universal end to the yoke and at the other end to the fulcrum anchor connection at the other end clamping bolts of said ring. 19

of said bar; a circumferentially grooved 001- In testimony whereof We have signed our lar fixed upon the barrel; a sectional ring names to this specification.

seated in the groove of the collar; bolts AUSTIN nWILLiAMs. clamping said ring in its seat; and a pair of p F RANK J. HICKEY. 

